What is CVE-2026-82120?

CVE-2026-82120 is a critical-severity vulnerability in Hitachi Hirdb Server Version 10, classified under Heap-based Buffer Overflow. CVSS score: 9.8/10. Published 2026-10-27.

How severe is CVE-2026-82120?

Critical severity. CVSS v3 base score is 9.8 out of 10.

Buffer overflow in Hitachi Hirdb Server Version 10

CVE-2026-82120

Heap-based Buffer Overflow Vulnerability in HiRDB. This issue affects HiRDB Server Version 10: from 10-00 before 10-12-01; HiRDB Server Version 9: from 09-00 through 09-66-22; HiRDB Server with Additional Function Version 9: from 09-00 through 09-66/V; HiRDB Server Version 9(32): from 09-02 through 09-66-22; HiRDB Server with Additional Function Version 9(32): from 09-00 through 09-66-/V.

Vulnerability class: Buffer Overflow

Published 2026-10-27 · last modified 2026-10-27.

CVSS v3 metric

CVSS v3 base score 9.8 (Critical). Vector: CVSS:3.1/AV:N/AC:L/PR:N/UI:N/S:U/C:H/I:H/A:H.

EPSS exploit prediction

No EPSS score from FIRST.org yet. New CVEs usually get one within a few days; no score means no signal yet, not low risk. How EPSS works.

Affected products

Weakness classification (CWE)

CWE-122 — Heap-based Buffer Overflow

References

www.hitachi.com/products/it/software/security/info/vuls/hitachi-sec-2026-147/in… (vendor-advisory)

Frequently asked questions

What is CVE-2026-82120?: CVE-2026-82120 is a critical-severity vulnerability in Hitachi Hirdb Server Version 10, classified under Heap-based Buffer Overflow. CVSS score: 9.8/10. Published 2026-10-27.
How severe is CVE-2026-82120?: Critical severity. CVSS v3 base score is 9.8 out of 10.